Demographics by intervention group
| Intervention group | |||||||
|---|---|---|---|---|---|---|---|
| A (n = 122) | B (n = 125) | C (n = 115) | |||||
| n | % | n | % | n | % | p value | |
| FE, Fisher’s exact test. | |||||||
| Age | |||||||
| 18–24 | 19 | (15.6) | 24 | (19.2) | 25 | (21.7) | 0.98 |
| 25–34 | 59 | (48.4) | 56 | (44.8) | 52 | (45.2) | |
| 35–44 | 29 | (23.8) | 30 | (24.0) | 26 | (22.6) | |
| 45–54 | 13 | (10.7) | 12 | (9.6) | 10 | (8.7) | |
| 55+ | 2 | (1.6) | 3 | (2.4) | 2 | (1.7) | |
| Gender | |||||||
| Male | 30 | (24.6) | 28 | (22.4) | 25 | (21.7) | 0.86 |
| Female | 92 | (75.4) | 97 | (77.6) | 90 | (78.3) | |
| Ethnicity | |||||||
| White, not of Hispanic origin | 68 | (56.6) | 68 | (55.7) | 74 | (66.1) | 0.21 |
| Other | 52 | (43.3) | 54 | (44.3) | 38 | (33.9) | |
| Missing | 2 | 3 | 3 | ||||
| Education—college graduate | |||||||
| Yes | 93 | (77.5) | 79 | (64.8) | 86 | (76.8) | 0.04 |
| No | 27 | (22.5) | 43 | (35.3) | 26 | (23.2) | |
| Missing | 2 | 3 | 3 | ||||
| Current smoker | |||||||
| No | 107 | (89.2) | 112 | (91.8) | 105 | (93.8) | 0.45 |
| Yes | 13 | (10.8) | 10 | (8.2) | 7 | (6.3) | |
| Missing | 2 | 3 | 3 | ||||
| Hand dominance | |||||||
| Left handed | 9 | (7.5) | 13 | (10.7) | 9 | (8.0) | 0.65 |
| Right handed | 111 | (92.5) | 109 | (89.3) | 103 | (92.0) | |
| Missing | 2 | 3 | 3 | ||||
| Income | |||||||
| Less than $35 000 | 36 | (30.8) | 49 | (40.5) | 39 | (35.8) | 0.61 |
| $35 000–$74 999 | 53 | (45.3) | 48 | (39.7) | 44 | (40.4) | |
| $75 000 and over | 28 | (23.9) | 24 | (19.8) | 26 | (23.9) | |
| Missing | 5 | 4 | 6 | ||||
| BMI—males | |||||||
| <25 | 14 | (46.7) | 14 | (50.0) | 16 | (64.0) | 0.14 (FE) |
| 25–29.9 | 9 | (30.0) | 13 | (46.4) | 7 | (28.0) | |
| 30+ | 7 | (23.3) | 1 | (3.6) | 2 | (8.0) | |
| BMI—females | |||||||
| <25 | 54 | (58.7) | 58 | (59.8) | 59 | (65.6) | 0.33 |
| 25–29.9 | 28 | (30.4) | 22 | (22.7) | 23 | (25.6) | |
| 30+ | 10 | (10.9) | 17 | (17.5) | 8 | (8.9) | |